Vitamin D deficiency is a globally prevalent public health problem, with substantial implications for bone health and metabolic functions. Despite abundant sunshine, India, including the southern state of Kerala, reports high prevalence of vitamin D deficiency due to factors like sedentary lifestyle, indoor confinement, dietary habits, and cultural practices. This study aims to assess the prevalence of vitamin D deficiency among adults (aged 18–50 years) attending the laboratory of a tertiary care hospital in Kerala, specifically Neyyar Medicity.

This cross-sectional study will involve 60 adult participants who undergo serum 25-hydroxyvitamin D testing. Data collection will be conducted through a structured and validated questionnaire that captures socio-demographic data, sun exposure, dietary patterns, lifestyle factors, and awareness about vitamin D. The primary objective is to estimate the proportion of individuals with deficient vitamin D levels, while secondary objectives include identifying contributing risk factors and gauging participant knowledge about deficiency symptoms and consequences.

Findings from this study are expected to guide awareness campaigns and preventive strategies in the community and contribute to developing public health recommendations to tackle this silent epidemic. Ethical approval has been obtained from the Institutional Ethics Committee of Pankajakasthuri Ayurveda Medical College and PG Centre, Trivandrum.